// Description								/*{{{*/
// $Id: indexcopy.cc,v 1.2 2002/07/25 18:07:18 niemeyer Exp $
/* ######################################################################

   Index Copying - Aid for copying and verifying the index files

   This class helps apt-cache reconstruct a damaged index files.

   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <config.h>

#include "indexcopy.h"

#include <apt-pkg/error.h>
#include <apt-pkg/progress.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/tagfile.h>

#include <iostream>
#include <unistd.h>
#include <sys/stat.h>
#include <stdio.h>
									/*}}}*/

using namespace std;

// IndexCopy::CopyPackages - Copy the package files from the CD		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool IndexCopy::CopyPackages(const string &CDROM,const string &Name,vector<string> &List)
{
   if (List.size() == 0)
      return true;

   OpTextProgress Progress;

   bool NoStat = _config->FindB("APT::CDROM::Fast",false);
   bool Debug = _config->FindB("Debug::aptcdrom",false);

   // Prepare the progress indicator
   unsigned long TotalSize = 0;
   for (vector<string>::iterator I = List.begin(); I != List.end(); I++)
   {
      struct stat Buf;
      if (stat(string(*I + GetFileName()).c_str(),&Buf) != 0 &&
	  stat(string(*I + GetFileName() + ".gz").c_str(),&Buf) != 0)
	 return _error->Errno("stat","Stat failed for %s",
			      string(*I + GetFileName()).c_str());
      TotalSize += Buf.st_size;
   }

   unsigned long CurrentSize = 0;
   unsigned int NotFound = 0;
   unsigned int WrongSize = 0;
   unsigned int Packages = 0;
   for (vector<string>::iterator I = List.begin(); I != List.end(); I++)
   {
      string OrigPath = string(*I,CDROM.length());
      unsigned long FileSize = 0;

      // Open the package file
      FileFd Pkg;
      if (FileExists(*I + GetFileName()) == true)
      {
	 Pkg.Open(*I + GetFileName(),FileFd::ReadOnly);
	 FileSize = Pkg.Size();
      }
      else
      {
	 FileFd From(*I + GetFileName() + ".gz",FileFd::ReadOnly);
	 if (_error->PendingError() == true)
	    return false;
	 FileSize = From.Size();

	 // Get a temp file
	 FILE *tmp = tmpfile();
	 if (tmp == 0)
	    return _error->Errno("tmpfile","Unable to create a tmp file");
	 Pkg.Fd(dup(fileno(tmp)));
	 fclose(tmp);

	 // Fork gzip
	 int Process = fork();
	 if (Process < 0)
	    return _error->Errno("fork","Couldn't fork gzip");

	 // The child
	 if (Process == 0)
	 {
	    dup2(From.Fd(),STDIN_FILENO);
	    dup2(Pkg.Fd(),STDOUT_FILENO);
	    SetCloseExec(STDIN_FILENO,false);
	    SetCloseExec(STDOUT_FILENO,false);

	    const char *Args[3];
	    string Tmp =  _config->Find("Dir::bin::gzip","gzip");
	    Args[0] = Tmp.c_str();
	    Args[1] = "-d";
	    Args[2] = 0;
	    execvp(Args[0],(char **)Args);
	    exit(100);
	 }

	 // Wait for gzip to finish
	 if (ExecWait(Process,_config->Find("Dir::bin::gzip","gzip").c_str(),false) == false)
	    return _error->Error("gzip failed, perhaps the disk is full.");

	 Pkg.Seek(0);
      }
      pkgTagFile Parser(&Pkg);
      if (_error->PendingError() == true)
	 return false;

      // Open the output file
      char S[400];
      snprintf(S,sizeof(S),"cdrom:[%s]/%s%s",Name.c_str(),
	       (*I).c_str() + CDROM.length(),GetFileName());
      string TargetF = _config->FindDir("Dir::State::lists") + "partial/";
      TargetF += URItoFileName(S);
      if (_config->FindB("APT::CDROM::NoAct",false) == true)
	 TargetF = "/dev/null";
      FileFd Target(TargetF,FileFd::WriteEmpty);
      FILE *TargetFl = fdopen(dup(Target.Fd()),"w");
      if (_error->PendingError() == true)
	 return false;
      if (TargetFl == 0)
	 return _error->Errno("fdopen","Failed to reopen fd");

      // Setup the progress meter
      Progress.OverallProgress(CurrentSize,TotalSize,FileSize,
			       string("Reading ") + Type() + " Indexes");

      // Parse
      Progress.SubProgress(Pkg.Size());
      pkgTagSection Section;
      this->Section = &Section;
      string Prefix;
      unsigned long Hits = 0;
      unsigned long Chop = 0;
      while (Parser.Step(Section) == true)
      {
	 Progress.Progress(Parser.Offset());
	 string File;
	 unsigned long Size;
	 if (GetFile(File,Size) == false)
	 {
	    fclose(TargetFl);
	    return false;
	 }

	 if (Chop != 0)
	    File = OrigPath + ChopDirs(File,Chop);

	 // See if the file exists
	 bool Mangled = false;
	 if (NoStat == false || Hits < 10)
	 {
	    // Attempt to fix broken structure
	    if (Hits == 0)
	    {
	       if (ReconstructPrefix(Prefix,OrigPath,CDROM,File) == false &&
		   ReconstructChop(Chop,*I,File) == false)
	       {
		  if (Debug == true)
		     clog << "Missed: " << File << endl;
		  NotFound++;
		  continue;
	       }
	       if (Chop != 0)
		  File = OrigPath + ChopDirs(File,Chop);
	    }

	    // Get the size
	    struct stat Buf;
	    if (stat(string(CDROM + Prefix + File).c_str(),&Buf) != 0 ||
		Buf.st_size == 0)
	    {
	       // Attempt to fix busted symlink support for one instance
	       string OrigFile = File;
	       string::size_type Start = File.find("binary-");
	       string::size_type End = File.find("/",Start+3);
	       if (Start != string::npos && End != string::npos)
	       {
		  File.replace(Start,End-Start,"binary-all");
		  Mangled = true;
	       }

	       if (Mangled == false ||
		   stat(string(CDROM + Prefix + File).c_str(),&Buf) != 0)
	       {
		  if (Debug == true)
		     clog << "Missed(2): " << OrigFile << endl;
		  NotFound++;
		  continue;
	       }
	    }

	    // Size match
	    if ((unsigned)Buf.st_size != Size)
	    {
	       if (Debug == true)
		  clog << "Wrong Size: " << File << endl;
	       WrongSize++;
	       continue;
	    }
	 }

	 Packages++;
	 Hits++;

	 if (RewriteEntry(TargetFl,File) == false)
	 {
	    fclose(TargetFl);
	    return false;
	 }
      }
      fclose(TargetFl);

      if (Debug == true)
	 cout << " Processed by using Prefix '" << Prefix << "' and chop " << Chop << endl;

      if (_config->FindB("APT::CDROM::NoAct",false) == false)
      {
	 // Move out of the partial directory
	 Target.Close();
	 string FinalF = _config->FindDir("Dir::State::lists");
	 FinalF += URItoFileName(S);
	 if (rename(TargetF.c_str(),FinalF.c_str()) != 0)
	    return _error->Errno("rename","Failed to rename");

	 // Copy the release file
	 snprintf(S,sizeof(S),"cdrom:[%s]/%sRelease",Name.c_str(),
		  (*I).c_str() + CDROM.length());
	 string TargetF = _config->FindDir("Dir::State::lists") + "partial/";
	 TargetF += URItoFileName(S);
	 if (FileExists(*I + "Release") == true)
	 {
	    FileFd Target(TargetF,FileFd::WriteEmpty);
	    FileFd Rel(*I + "Release",FileFd::ReadOnly);
	    if (_error->PendingError() == true)
	       return false;

	    if (CopyFile(Rel,Target) == false)
	       return false;
	 }
	 else
	 {
	    // Empty release file
	    FileFd Target(TargetF,FileFd::WriteEmpty);
	 }

	 // Rename the release file
	 FinalF = _config->FindDir("Dir::State::lists");
	 FinalF += URItoFileName(S);
	 if (rename(TargetF.c_str(),FinalF.c_str()) != 0)
	    return _error->Errno("rename","Failed to rename");
      }

      /* Mangle the source to be in the proper notation with
	 prefix dist [component] */
      *I = string(*I,Prefix.length());
      ConvertToSourceList(CDROM,*I);
      *I = Prefix + ' ' + *I;

      CurrentSize += FileSize;
   }
   Progress.Done();

   // Some stats
   cout << "Wrote " << Packages << " records" ;
   if (NotFound != 0)
      cout << " with " << NotFound << " missing files";
   if (NotFound != 0 && WrongSize != 0)
      cout << " and";
   if (WrongSize != 0)
      cout << " with " << WrongSize << " mismatched files";
   cout << '.' << endl;

   if (Packages == 0)
      _error->Warning("No valid records were found.");

   if (NotFound + WrongSize > 10)
      cout << "Alot of entries were discarded, something may be wrong." << endl;

   return true;
}
									/*}}}*/
// IndexCopy::ChopDirs - Chop off the leading directory components	/*{{{*/
// ---------------------------------------------------------------------
/* */
string IndexCopy::ChopDirs(const string &Path,unsigned int Depth)
{
   string::size_type I = 0;
   do
   {
      I = Path.find('/',I+1);
      Depth--;
   }
   while (I != string::npos && Depth != 0);

   if (I == string::npos)
      return string();

   return string(Path,I+1);
}
									/*}}}*/
// IndexCopy::ReconstructPrefix - Fix strange prefixing			/*{{{*/
// ---------------------------------------------------------------------
/* This prepends dir components from the path to the package files to
   the path to the deb until it is found */
bool IndexCopy::ReconstructPrefix(string &Prefix,const string &OrigPath, const string &CD,
				  const string &File)
{
   bool Debug = _config->FindB("Debug::aptcdrom",false);
   unsigned int Depth = 1;
   string MyPrefix = Prefix;
   while (1)
   {
      struct stat Buf;
      if (stat(string(CD + MyPrefix + File).c_str(),&Buf) != 0)
      {
	 if (Debug == true)
	    cout << "Failed, " << CD + MyPrefix + File << endl;
	 if (GrabFirst(OrigPath,MyPrefix,Depth++) == true)
	    continue;

	 return false;
      }
      else
      {
	 Prefix = MyPrefix;
	 return true;
      }
   }
   return false;
}
									/*}}}*/
// IndexCopy::ReconstructChop - Fixes bad source paths			/*{{{*/
// ---------------------------------------------------------------------
/* This removes path components from the filename and prepends the location
   of the package files until a file is found */
bool IndexCopy::ReconstructChop(unsigned long &Chop,const string &Dir,const string &File)
{
   // Attempt to reconstruct the filename
   unsigned long Depth = 0;
   while (1)
   {
      struct stat Buf;
      if (stat(string(Dir + File).c_str(),&Buf) != 0)
      {
	 File = ChopDirs(File,1);
	 Depth++;
	 if (File.empty() == false)
	    continue;
	 return false;
      }
      else
      {
	 Chop = Depth;
	 return true;
      }
   }
   return false;
}
									/*}}}*/
// IndexCopy::ConvertToSourceList - Convert a Path to a sourcelist	/*{{{*/
// ---------------------------------------------------------------------
/* We look for things in dists/ notation and convert them to
   <dist> <component> form otherwise it is left alone. This also strips
   the CD path.

   This implements a regex sort of like:
    (.*)/dists/([^/]*)/(.*)/binary-*
     ^          ^      ^- Component
     |          |-------- Distribution
     |------------------- Path

   It was deciced to use only a single word for dist (rather than say
   unstable/non-us) to increase the chance that each CD gets a single
   line in sources.list.
 */
void IndexCopy::ConvertToSourceList(const string &CD,string &Path)
{
   char S[300];
   snprintf(S,sizeof(S),"binary-%s",_config->Find("Apt::Architecture").c_str());

   // Strip the cdrom base path
   Path = string(Path,CD.length());
   if (Path.empty() == true)
      Path = "/";

   // Too short to be a dists/ type
   if (Path.length() < strlen("dists/"))
      return;

   // Not a dists type.
   if (stringcmp(Path.c_str(),Path.c_str()+strlen("dists/"),"dists/") != 0)
      return;

   // Isolate the dist
   string::size_type Slash = strlen("dists/");
   string::size_type Slash2 = Path.find('/',Slash + 1);
   if (Slash2 == string::npos || Slash2 + 2 >= Path.length())
      return;
   string Dist = string(Path,Slash,Slash2 - Slash);

   // Isolate the component
   Slash = Slash2;
   for (unsigned I = 0; I != 10; I++)
   {
      Slash = Path.find('/',Slash+1);
      if (Slash == string::npos || Slash + 2 >= Path.length())
	 return;
      string Comp = string(Path,Slash2+1,Slash - Slash2-1);

      // Verify the trailing binary- bit
      string::size_type BinSlash = Path.find('/',Slash + 1);
      if (Slash == string::npos)
	 return;
      string Binary = string(Path,Slash+1,BinSlash - Slash-1);

      if (Binary != S && Binary != "source")
	 continue;

      Path = Dist + ' ' + Comp;
      return;
   }
}
									/*}}}*/
// IndexCopy::GrabFirst - Return the first Depth path components	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool IndexCopy::GrabFirst(const string &Path,string &To,unsigned int Depth)
{
   string::size_type I = 0;
   do
   {
      I = Path.find('/',I+1);
      Depth--;
   }
   while (I != string::npos && Depth != 0);

   if (I == string::npos)
      return false;

   To = string(Path,0,I+1);
   return true;
}
									/*}}}*/
// PackageCopy::GetFile - Get the file information from the section	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool PackageCopy::GetFile(string &File,unsigned long &Size)
{
   File = Section->FindS("Filename");
   Size = Section->FindI("Size");
   if (File.empty() || Size == 0)
      return _error->Error("Cannot find filename or size tag");
   return true;
}
									/*}}}*/
// PackageCopy::RewriteEntry - Rewrite the entry with a new filename	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool PackageCopy::RewriteEntry(FILE *Target,const string &File)
{
   TFRewriteData Changes[] = {{"Filename",File.c_str()},
                              {}};

   if (TFRewrite(Target,*Section,TFRewritePackageOrder,Changes) == false)
      return false;
   fputc('\n',Target);
   return true;
}
									/*}}}*/
// SourceCopy::GetFile - Get the file information from the section	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool SourceCopy::GetFile(string &File,unsigned long &Size)
{
   string Files = Section->FindS("Files");
   if (Files.empty() == true)
      return false;

   // Stash the / terminated directory prefix
   string Base = Section->FindS("Directory");
   if (Base.empty() == false && Base[Base.length()-1] != '/')
      Base += '/';

   // Read the first file triplet
   const char *C = Files.c_str();
   string sSize;
   string MD5Hash;

   // Parse each of the elements
   if (ParseQuoteWord(C,MD5Hash) == false ||
       ParseQuoteWord(C,sSize) == false ||
       ParseQuoteWord(C,File) == false)
      return _error->Error("Error parsing file record");

   // Parse the size and append the directory
   Size = atoi(sSize.c_str());
   File = Base + File;
   return true;
}
									/*}}}*/
// SourceCopy::RewriteEntry - Rewrite the entry with a new filename	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool SourceCopy::RewriteEntry(FILE *Target,const string &File)
{
   string Dir(File,0,File.rfind('/'));
   TFRewriteData Changes[] = {{"Directory",Dir.c_str()},
                              {}};

   if (TFRewrite(Target,*Section,TFRewriteSourceOrder,Changes) == false)
      return false;
   fputc('\n',Target);
   return true;
}
									/*}}}*/
